I have 4.2. To make it short, I get this:
ES_AddTitleStart returned -2011
You need to use an IOS with trucha bug.
That's what the IOS15 downgrade is good for...
IOS36 Installation failed.
Press any button to exit...
It's pretty much like this guy's problem but mine wasn't solved by retrying (I tried over 15 times). I used a different guide so here it is:
Following a guide for 3.0-4.1 on a 4.2 Wii is pretty silly, you could try it a thousands times and it would never work.
Not really doing much Wii stuff these days.